Hydrogen storage technologies in low weight hydrides promise to help with the global aim of CO2-emissions reduction. High mass energy densities are needed e.g. for heavy-load long distance mobility like trains, trucks, and airplanes. One of the potential reaction based systems is Mg(NH2)2+LiH with a reversible hydrogen capacity of 5.6 wt.% below 200oC. The kinetics of hydrogen...
In-situ experiments with ultracold neutrons (UCN) present an opportunity to profit from long observation times and high densities, but must confront numerous practical challenges. I will discuss the challenges and opportunities connected with in-situ measurements of the neutron's electric dipole moment, focusing on a modular multichamber concept based on UCN production, storage, and...
Clamp cells optimized for neutron scattering at low temperatures on the instruments DNS, MIRA, HEiDi, and POLI at the Heinz Maier-Leibnitz Zentrum [1] will be presented. The monobloc cell is available in two variants made of a CuBe alloy and a NiCrAl alloy, operational up to about 1.1 GPa and 1.5 GPa, respectively. Measurements aimed to elucidate magnetic properties are now possible due to the...
Heavy mineral separates from Hungarian sand samples were measured by instrumental NAA at the Budapest Research Reactor (BRR), but the amounts and weights of them were way too small to also analyze them effectively at the PGAA station of the BNC. Combined PGAA and in-beam NAA experiments were made on the samples at FRM-II to study their possibilities.
First, the mineral separates were...
Magnetic dipole traps have demonstrated good confinement properties for both non-neutral and quasi-neutral plasmas, making them highly suitable for the creation and study of low-temperature, long-lived electron-positron pair plasmas. To generate such a plasma, the APEX (A Positron-Electron eXperiment) Collaboration is planning to inject positrons (supplied by the reactor-based beam NEPOMUC,...
Although the idea of a ‘cooperativity’ length scale ξ related to the glass transition is now wide-spread, there is much less consensus on whether this length scale can be related to thermodynamic fluctuations and, if yes, whether one has to consider temperature fluctuations δT. The crucial experiment to this end has to compare values of ξ from ‘thermodynamic’ formulae to independent values...
It is a common practice in science to approach a problem simultaneously from the theoretical and experimental side. However, it is important to compare theory and experiment as directly as possible in order to validate that the theory describes reality. This contribution focuses on bridging the gap between simulations and scattering experiments with neutrons and X-rays.
Although...
The itinerant ferromagnet nickel has a long history of studies investigating its spin wave and critical, paramagnetic scattering over a large range in temperature. Close to $T_C$ = 631 K, the behavior of Ni, as observed with neutron scattering, is well explained by mode coupling and renormalization group theory calculations based on the isotropic Heisenberg model. According to scaling theory,...
The water dynamics is key to functionality and phase behavior of synthetic and biological polymers. Responsive polymers react strongly to external stimuli such as temperature and pressure triggering chain collapse and phase separation. We investigate the dynamic behavior of hydration water in a 25 wt% aqueous poly(N-isopropyl acrylamide) (PNIPAM) solution in dependence on temperature (25 –...
Among new alloy systems being developed to supplement Ni-based superalloys in gas turbine applications, the Co-Re-based alloys show promise because of their excellent specific strength and relatively high melting range (1490°-1560°C). Alloying elements with various functions are added to these alloys. For example, Cr, and Ni, for oxidation resistance. Since the Co matrix undergoes an...
Optimization of the shape and intensity of a positron beam requires suitable beam diagnostics. The speed with which a low-energy positron beam can be optimized prior to a measurement is presently limited by available detection techniques, resulting in a sizeable loss of beam time to optimization. In this talk we will present two novel approaches to the detection of the position, shape and...
Magnetic excitations in stripe-phases of $La-$based hole-doped $214-$ nickelates, especially in the $Sr-$doped ones, have been vigorously explored using inelastic neutron scattering (INS) studies. In $Sr-$ doped samples, the spin stripe correlation is relatively short-ranged due to unavoidable disorder introduced by the randomly distributed dopant. However, often the results have been compared...
We report a comprehensive study of single crystals of the noncentrosymmetric rare-earth compound $\mathrm{EuPtSi}_{3}$ grown by the optical floating-zone technique. Measurements of the magnetization, ac susceptibility, and specific heat consistently establish antiferromagnetic order of localized $\mathrm{Eu}^{2+}$ moments below the Néel temperature $T_{\mathrm{N}} = 17~\mathrm{K}$, followed by...
We aim to apply “materials informatics” (MI) for the development of high-performance anion-exchange membranes (AEM), which may be applied to next generation energy devices, such as non-platinum fuel cell hybrid vehicles and all solid secondary batteries. Currently, there are two major obstacles to using MI for such systems: the unclear higher-order (hierarchical) structure/function...
Supramolecular polymers offer exciting prospects for materials with novel properties because of the reversibility of the non-covalent interactions, like H-bonding.[1,2] This work aims to unravel the correlation between H-bonding association and main chain polarity in supramolecular polymer melts. These are based on poly(ethylene)oxide (PEO) and poly(propylene)oxide (PPO) (in order of...
The ultimate goals of the APEX (A Positron Electron eXperiment) Collaboration are the generation and investigation of conned, strongly magnetized, electron-positron plasmas in the laboratory. The mass symmetry of such plasmas simplifies many aspects of their physics, as has been described in more than four decades of theory/simulation predictions.
Our road map to conducting experimental...
In the last two years the neutron optics group of FRM II has successfully sputtered non-depolarizing m=2 Cu/Ti supermirrors, which have been prepared with a standard DC magnetron sputtering facility. Control on the roughness grow and interdiffusion allowed us to get a very good maximum angle of total reflection (ca. 0.21°/λ) and polarized neutron reflectivity above 90%, as measured at the...
Structural investigations on functional ceramics is an important tool for material characterisation and tailoring of properties for specialised applications. This frequently requires high angular resolu-tion to resolve highly correlated phase coexistences or subtle structural features. The most common tool is high resolution X-ray or synchrotron radiation. Especially for in situ investigations...
The last two decades have seen the demonstration of the feasibility of neutron diffraction in fields as high as 40 T with the development of dedicated pulsed field devices based either on short or long duration pulsed magnets [1, 2]. These breakthroughs have allowed to extend the field limits beyond current superconducting (15 T split, 17 T solenoid) and resistive installations already...
Imaging techniques based on neutron beams are rapidly developing and have become versatile non-destructive analysing tools in many research fields. Due to their intrinsic properties, neutrons differ strongly from electrons, protons or X-rays in terms of their interaction with matter: they penetrate deeply into most common metallic materials while they have a high sensitivity to light elements...
Pressure is next to temperature the key thermodynamic parameter for the exploration of condensed matter. In this talk I will survey the state of the art of high pressure neutron scattering, covering both diffraction and inelastic scattering. I will focus on more recent methods able to reach pressures of 10 GPa and beyond, relevant for research on hard condensed matter. My talk will be largely...
Neutrons are powerful and have unique characteristics, which make possible non-destructive and operando characterizations of cylindrical and prismatic Li-ion batteries. X-rays are an equally competent tool that can provide complementary information on pouch type Li-ion cells during cell operation. Expectedly, both are also capable of providing information at material and electrode level. This...
The NOPTREX collaboration performs neutron spectroscopy measurements on p-wave resonances to quantify P-odd/T-odd measurement sensitivity. Beam-port adaptations to POLI would enable one of the highest fluxes of polarized eV neutrons in the world aided by the new 3He polarizer and analyzer. The 139La 0.7 eV p-wave resonance amplifies both parity-odd (P) and time-reversal odd (T) effects from...
Data obtained at a publicly funded research facility such as MLZ becomes available to other researchers after some period of time. The motivation for this policy is to make it possible to reuse data or verify published results. Given the huge variety of instruments, methods, and the extreme complexity of some of the experimental workflows, reuse of such data becomes absolutely impossible...
Lattice vibrations, i.e., phonons are ubiquitous in solids and getting detailed knowledge on them was one of the success stories of early inelastic neutron scattering. Nowadays, large neutron detectors along with ab-initio lattice dynamical calculations allow comprehensive experimental and theoretical mapping of phonon properties. However, calculations of lattice dynamics at or close to...
Orthorhombic Barium di-silicide (BaSi2) is an emerging sun light conversion material for thin film solar cells, owing to its suitable bandgap, high light absorption coefficient, and long minority-carrier lifetime. Moreover, Ba and Si are very abundant and environmentally benign materials. The nature of defects in BaSi2 thin films grown by Molecular Beam Epitaxy (MBE), Thermal Evaporation (TE),...
The neutron strain pilot projects within H2020- Sine2020 and BRIGHTNESS2 towards European neutron landscape & users have been key for facilitating industry access and collaborations in a regular basis. The shortcomings reducing the industrial experimental throughput are well known and very similar to all facilities. A central issue is the non-acceptance by industry to use the neutron technique...
Using the amide I band, infrared (IR-) spectroscopy can give information on the fold of the protein and also allows to follow aggregation phenomena. Small angle neutron scattering also reports on the global structure of proteins in solution and can give information on the shape of growing aggregates or folded proteins in solution.
We would like to explore the capabilities of infrared...
Fabricating functional material relies on non-equilibrium hydrodynamic flows. Spray deposition using atomization of complex liquids leads to a deposition of droplets on a substrate. The solvent evaporates and induces a complex flow in the dispersion. This leads to a nanostructuring of the nanoscale ingredients of the dispersion. Using cellulose nanofibrils and water as solvent, we have...
New high-flux and high-brilliance neutron sources demand a higher count-rate capability inneutron detectors. In order to achieve that goal, the Solid-State Neutron Detector (SoNDe)project developed a scintillation-based neutron detector. It is capable of fully exploiting theavailable flux current and coming neutron facilities, such as the European Spallation Source(ESS).[1] In addition to...
Inspired by the possible storage of nuclear waste in impermeable rock salt formations, numerous theoretical and applied studies have investigated the effect of gamma irradiation on the structural properties of halite over the last five decades. An important discovery has been the gamma irradiation - induced decoration of othervise invisible lattice defect substructures in this optically...
JALOUSIE is a modularized neutron detector concept that has been realized for the first time in POWTEX. It was developed to serve as alternative for classical 3He position sensitive detector tubes as used for large neutron scattering instruments. POWTEX has been fully instrumented at FRM II along this concept. Further JALOUSIE based systems are under production for DREAM and MAGiC at ESS.
The...
The Jülich Centre for Neutron Science offers the opportunity to fabricate thin film samples by Molecular Beam Epitaxy (MBE). We are running an MBE setup with effusion cells, electron guns for electron beam evaporation and a plasma source for use with oxygen or nitrogen. A large variety of deposition materials can be used. Please express your ideas! In the past, we have produced simple Fe...
The structures of materials under study are of ever-increasing complexity, now often exhibiting short-range order, nano-structure, or correlated disorder that affect their physical and/or functional properties. In order to quantify this increasing structural complexity, a maximal amount of information needs to be extracted from e.g. neutron diffraction patterns, whence the importance of...
The APEX collaboration aims to magnetically confine electron-positron pair plasma and diagnose the plasma with FPGA-processing of annihilation detections from an array of 48 Bismuth-Germanate (BGO) scintillators. Direct annihilation of pairs and the annihilation of positronium (Ps), formed through radiative and three-body recombination produce a volumetric source of gammas. Back-to-back...
Predicting helium retention in tungsten is of relevance for future nuclear fusion reactors as it influences tritium uptake and transport, two processes which are critical factors in achieving tritium self-sufficiency. While the macroscopic effects of helium agglomeration in tungsten are known it is still an open topic of discussion what the underlying processes on a microscopic scale are. Our...
Metal oxide interfaces are suitable functional materials for various energy applications. For example, TiO2 can act not only as an anode material in new generation photovoltaic and energy storage technol-ogies, but also in the photocatalytic production of hydrogen. For such applications, a controlled mor-phology on distinct length scales is particularly important to fulfill optimal performance...
Co-nonsolvency occurs if a mixture of two good solvents causes the collapse or demixing of polymers into a polymer-rich and solvent-rich phase in a certain range of compositions of these two solvents. The nonionic thermo-responsive polymer, poly(N-isopropylmethacrylamide) (PNIPMAM), which features a lower critical solution temperature (LCST) in aqueous solution, has been widely used to...
KWS-3 is a very small angle neutron scattering diffractometer operated by JCNS at Heinz Maier-Leibnitz Zentrum (MLZ) in Garching, Germany. The principle of this instrument is one-to-one imaging of an entrance aperture onto a 2D position sensitive detector by neutron reflection from a double-focusing toroidal mirror. In current state, KWS-3 is covering Q-range between 3·10-5 and 2·10-2 Å-1 and...
The investigation of thin films with Grazing Incidence Small Angle Neutron Scattering (GISANS) has been established as an advanced characterization method in the last years. Lateral structures from the nanometer to the micrometer range are accessible and different sample environments were developed for GISANS experiments under controlled environmental conditions. However, so far the access to...
A prominent strategy to increase the capacity of Lithium Ion Batteries is the use of silicon as anode material. However, the volumetric increase of silicon upon lithiation regularly results in a low cycling stability of the material. Our strategy is based on a partial lithiation of silicon to ~30%, which leads to a significant gain in cycling stability while maintaining a high capacity. The...
The new customized SAXS/WAXS instrument from XENOCS have be installed in the JCNS X-ray laboratory from the end of 2021. As a young member of our small angle scattering instrument by using x ray as beam, the new instrument is equipped with a high flux metal-jet source and a moveable Eiger 2R4M SAXS detector. With additional 4-axis motorized WAXS detector and Bonse-Hart USAXS the scattering...
Ni-based superalloys are essential for applications in demanding environments, such as jet engines or the heavily stressed rotating discs in the hot sections of modern gas turbines. Such environments typically challenge the material with a combination of high temperatures, high tensile loads, and oxidizing atmospheres. In this study, the polycrystalline Ni-based superalloy VDM 780® Alloy 780...
Natural protein fibers, silks, are expected as sustainable structural materials because of their excellent mechanical properties, especially the high-toughness nature with a good balance of strength and extensibility. However, the structural origin of the high-toughness of silks has not been well understood. So far, we have studied the hierarchical structure of many kinds of silks on the basis...
Lithium ion batteries (LIBs) with a wide range of applications have emerged as the most promising candidate for electrochemical energy storage due to its higher specific energies, volumetric energy densities and power densities. However, lithium dendrite will grow and the Coulombic efficiency (CE) will decrease with Li plating and stripping. During past decades, more and more state-of-art...
Over the past few years, hybrid perovskite materials have attracted tremendous interest due to its excellent photovoltaic properties in perovskite solar cells (PSCs) resulting in record power conversion efficiencies. The residual lead iodide is easy to form during the fabrication of perovskite layers, especially in case of the two-step deposition method. In addition, residual lead iodide has...
In order to provide our users the possibility to complete their neutron scattering data with real space images we will present the Electron Microscopy possibilities at MLZ consisting of a Cryogenic transmission electron microscope Cryo-TEM (JCNS) and an Environmental Scanning Electron Microscope ESEM (JCNS & Hereon).
TEM yield real space images of soft matter systems, particularly in...
Recently, organic solar cells have received increasing attention due to superior flexibility and being light weight. Among the structures of the active layer, planar and bulk heterojunction structures are commonly adopted, which have their individual intrinsic shortcomings. The new developed pseudo-bilayer structure can perfectly combine their strengths and circumvent their drawbacks....
Located at the SR10 at the FRM II, NECTAR is a versatile instrument and designed for the non-destructive inspection of various objects by means of fission neutron radiography and tomography. Compared to the Z-dependency of X-ray and gamma imaging, fission neutrons have the strong advantage of often providing similar contrast for heavy and light materials. Only few facilities around the world...
TRISP is currently transferred to the "Neutron Guide Hall East". A new ballistic neutron guide with elliptic and parabolic sections helps to avoid losses of the neutron flux, although the distance from the reactor increases from 10m to 30m. The ballistic guide also includes a cavity polarizer (length 3.6m) with a good polarization efficiency of ~90% in the wavelength band 1-4 Angström. We will...
Developing clean energy lies in the heart of sustainable development of human society. Triboelectric nanogenerator (TENG) originating from Maxwell’s displacement current is a new type of energy harvester for harnessing ambient mechanical energy based on the coupling effect of triboelectrification and electrostatic induction. Compared with other counterparts, owing to the light-weight,...
The 3He group has developed in-situ polarizers for many JCNS instruments including MARIA, TOPAS, KWS1, POLI, and KWS2 and will provide another two polarizers for the ESS for DREAM and TREX. We develop all 3He cells and magnetic systems in house, as well as the laser sources for the FRM2-based devices. We have also work towards wide angle analysis with C-shaped analyzer cell. The status and...
Cu-Ti alloys feature a large, undercooled liquid region and a high glass-forming ability (GFA) and thus, provide the possibility to obtain two component bulk metallic glasses (BMGs). Such behavior is unusual and could be due to the special properties of the Cu-Ti system: In the melt, it shows a positive excess volume, whereas it still features a negative enthalpy of mixing.
Even though, the...
Skyrmions are topologically non-trivial spin textures that exhibit an exceptionally efficient coupling to spin currents, notably spin-polarized charge currents and magnon currents as observed in MnSi, FeGe, and Cu2OSeO3 [1, 2, 3]. This raises the question for the microscopic mechanisms that control the pinning of the skyrmion lattice, and how they depend on the topology, electronic structure,...
At the cold triple axis instrument PANDA, a virtual twin based on Monte-Carlo ray-tracing simulations is used for educational purposes in student practical, training of newly arrived staff and experiment planning for users. The underlying McStas simulation is connected to the NICOS instrument control software, giving the virtual twin the look and feel of the real instrument. Also, instrumental...
Lithium has a high specific capacity of 3860 mAh g−1 and a low electrochemical potential (-3.04 V), promising a high energy density lithium metal battery (LMB). However, the growth of lithium dendrites during charging and discharging would penetrate the separators in LMBs, which leads to short circuit. To inhibit the growth of lithium dendrites, we focus on optimizing the SEI layer through...
Getting beamtime at MLZ and performing experiments for the first time is an exhilarating experience. For some new users, however, data analysis of acquired data is quite challenging. To avoid situations where valuable data is left untreated due to lack of experience and adequate support, MLZ creates a new group for user support, which will work in close cooperation with the instrument...
Research with neutrons, with its interdisciplinary approach, is indispensable for modern science. Taking into consideration tremendous changes in the European neutron landscape and assuming responsibility for sustainability, the neutron community is nowadays facing an important task to ensure long-term perspectives, that essentially depend on its ability to create a new generation of...
Stimuli responsive polymers have gained much attention due to their unique properties. If polymer thin films exhibit a reversible volume change upon exposure to external stimuli such as temperature, pH, or solvents, they become promising candidates for applications such as nanoswitches or sensors. Polymers like poly(N-isopropyl methacrylamide) (PNIPMAM), which are sensitive to two stimuli can...
SAPHiR, the Six Anvil Press for High Pressure Radiography and Diffraction, belongs to a suite of new instruments at the FRM II neutron source in Garching. The instrument will provide high pressure and temperature environments for in situ neutron measurements of powder samples, fluids, and melts. The pressure is generated by a cubic multi-anvil press, currently capable of reaching 15 GPa, with...
Mushroom is a concept of an indirect neutron spectrometer with a secondary spectrometer based on a super flat-cone analyser made of highly oriented pyrolytic graphite with an array of position-sensitive detectors (PSD) below it. This combination of the analyser and PSD gives the complete information of the outgoing wave vectors from each detected point on the PSDs. The idea has been first...
Polydiacetylenes (PDAs) are color-responsive polymers to various stimuli. The development of PDAs as anionic surfactant sensors by structural modification involved complicated and costly processes. In this study, we introduce a facile approach for preparing polydiacetylene/zinc (II) ion/zinc oxide (PDA/Zn2+/ZnO) nanocomposites utilized for anionic surfactant detection. Cationic surfactant,...
Self-assembled morphologies of thin films of a pentablock terpolymer with a symmetric architecture of two types of pH-responsive midblocks and short hydrophobic end blocks are investigated. Different degrees of charge, installed for the two pH-responsive blocks by varying the pH-value of the aqueous solution used for spin-coating, strongly define the film formation behaviour [1]. However, with...
Organic semiconductors have attracted intense attention due to their potential use in mechanically flexible, lightweight, and inexpensive electronic devices. Especially, poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate)(PEDOT:PSS) is the most studied conducting polymer system due to its intrinsically high electrical conductivity, low thermal conductivity, and high mechanical...
Neutron Activation Analysis is still one of the most sensitive trace-element analytical method. FRM II reactor offers unique possibilities for NAA with its high-flux highly thermalized neutron field. The method has been made available in the user system. The reactor is equipped with several irradiation facilities: rabbits, capsule irradiation system and the so-called "fishing line" position...
Thermoelectric (TE) generators are considered a promising technique for heat waste recovery as they enable a direct conversion of a temperature gradient into electrical power. Especially polymer based organic thermoelectric materials, like the blend poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), are very advantageous, as these materials allow a large scale, low-cost...
Our goal is to fabricate colloidal photonic layers exploiting structural colors in cellulosic materials. The colloidal distribution is a result of the self-assembly of colloidal particles during the drying process after spraying deposition. Therefore, the aim of our experiments is to follow the colloidal layer development during spray coating of colloidal inks used for lay-er formation on...
Ordered porous gold/titanium dioxide (Au/TiO2) hybrid nanostructured films are specifically interesting in large-scale applications using localized surface plasmon resonances (LSPRs) and surface-enhanced Raman scattering (SERS). In this work, we investigate the optical response of sputter-deposited Au/TiO2 nanohybrid thin films with a focus on the plasmonic response and application as...
All-solid-state lithium batteries (ASSLBs) have received extensive attention as one of the most promising power sources for flexible and wearable electronics, mainly because of their high flexibility, high energy density and reliable safety. However, the practical application of ASSLBs has been hindered by the poor interfacial stability and inferior ionic conductivity. Therefore, the...
With high energy density, long lifespan, and environmental friendliness, lithium-ion batteries (LIBs) represent one of the most attractive energy storage devices and are playing increasing roles in modern society. This technology is already present in the portable electronics markets, electric vehicles, and small-scale energy storage systems. For higher performances, changing the anode...
Lithium secondary batteries (LSBs) have witnessed explosive growth in the last decade. Traditional Li-ion batteries, on the other hand, are severely constrained in high-temperature applications due to the low thermal stability of the electrolyte/electrode interface and electrolyte decompositions in the cell. Herein, we demonstrate a new electrolyte that achieves an excellent stable long-term...
The freedom in complexity of AM metal parts allows very stiff and extreme light designs made of AlSi11Mg0.5 alloy and are entering serial production in automotive industry amongst others. Nevertheless, the production process of laser powder bed fusion (LPBF) is prone to the formation of residual stresses (RS). Furthermore, the parts may have distortions and must undergo a subsequent heat...
We review the impact of new and highly precise neutron beta decay data with a focus on recent results from neutron lifetime, beta asymmetry, and electron-neutrino correlation experiments. From these results, we extract weak interaction parameters with unprecedented precision. This is enabled also by progress in effective field theory and lattice quantum chromodynamics. Limits on New Physics...
The author will present the actual status of the work at the MEPHISTO beamline and the Helium cryoplant system.
The integration of the nanoparticles with proteins has a prime interest in the field of nanobiotechnology where these complexes are aimed to be utilized in different applications such as targeted drug delivery, biosensing, etc. [1]. The protein adsorption on nanoparticles is governed by several interactions such as hydrogen bonding, electrostatic complexion, hydrophobic attraction, etc....
The thermal triple-axis-spectrometer PUMA at the neutron research reactor FRM-II (MLZ) is one of the most robust, and yet extremely flexible instruments worldwide of its kind. In addition to the “normal triple axis” setup, PUMA delivers a good number of unique features to meet the ever-growing demands of the scientific community worldwide. Multiplexing, using the multi-analyzer and...
Polarized neutron diffraction is a powerful tool for studying condensed matter physics and to probe the spin and orbital properties of unpaired electrons. POLI is a polarized neutron single crystal diffractometer built on the hot neutron source at MLZ. Currently three standard setups are implemented on POLI: 1) zero-field spherical neutron polarimetry using CRYOPAD; 2) polarized neutron...
The MIEZE (Modulated IntEnsity with Zero Effort) resonant spin-echo technique at the RESEDA instrument at FRM II has its optimum resolution at small scattering angles, i.e. SANS type geometries. Recent upgrades (MIASANS) have further increased the resolution in the small angle regime. Going forward, there is the possibility [1] to extend the optimum MIEZE resolution to wide angles by...
The high-intensity reflectometer MARIA of JCNS, is installed in the neutron guide hall of the FRM-II reactor and is using a velocity selector (4.5Å<λ<40Å) with a resolution of 10%. By using Fermi-Chopper the wavelength resolution can be increased to 1% or 3%. The beam is polarized by a double-reflecting super mirror (4.5Å<λ<12Å) and in the vertical direction the elliptically focusing neutron...
KWS-2 is a classical small angle neutron diffractometer where the pinhole mode with different neutron-wavelengths and detector distances can be combined with focusing mode with MgF2 lenses to reach a wide Q-range between 2x10-4 and 1 Å-1. Upgrades in the detection system and sample environment are currently in progress. A wide-angle detection option is currently in test and optimization and...
As the demand for better and FAIR handling of generated data increase, we are implementing a new user portal that will provide:
- Data catalog with metadata about the collect datasets
- Data evaluation platform
- New Single-sign-on system
The RESEDA (Resonant Spin-Echo for Diverse Applications) instrument has been optimized for neutron scattering measurements of quasi-elastic and inelastic processes over a wide parameter range. One spectrometer arm of RESEDA is configured for the MIEZE (Modulation of Intensity with Zero Effort) technique, where the measured signal is an oscillation in neutron intensity over time prepared by two...
The Small-K Advanced DIffractometer (SKADI) is a joint in-kind project of French and German partners to deliver a SANS instrument to the ESS. [1,2] This contribution details the current construction status of SKADI. Further practical requirements on components such as the sample area will also be considered. SKADI is designed to deliver
-Flexibility (sample area is approx. 3x3 m$^2$, and...
Neutron-based analytical techniques (such as prompt gamma activation analysis and neutron activation analysis) are preferred in the non-destructive bulk analysis of archaeological objects, modern alloys with protective layer, and in case of materials containing elements that are insoluble for destructive quantitative analysis. Both nuclear analytical techniques are primary methods of...
The next generation asymmetric horizontal SANS magnet (NHSM) project will provide a unique toolset to study the quantum phenomena in nanostructures and correlated electron systems [1]. This project includes the idea, design and optimization, of a high-performance compensated asymmetric horizontal magnet for small angle neutron scattering (SANS), reflectometry (REFSANS), and the resonance spin...
The MIEZE method, a sub-type of the neutron spin echo (NSE) technique, circumvents the coupling of neutron beam phase space and resolution, by using oscillating neutron intensity as an internal clock to record minuscule changes to the energy of a scattered neutron. As a result MIEZE achieves an energy resolution down to the ns range with a bandwidth of ∆λ/λ ≈ 10 %.
This concept has been...
The PERC facility is currently under construction at the FRM II in Garching, Germany. It will serve as an intense and clean source of electrons and protons from neutron beta decay for precision studies. It aims to improve the measurements of the properties of weak interaction by one order of magnitude and to search for new physics via new effective couplings.
PERC's central component is a 12...
Dioctadecyldimethylammonium bromide (DODAB), show rich phase behavior [1]. We have studied the effects of Non-steroidal inflammatory drugs (NSAIDs), aspirin and indomethacin, on the phase behavior and the dynamics of DODAB lipid bilayer using quasielastic neutron scattering technique (QENS). Elastic window scan showed that aspirin and indomethacin shifts coagel to fluid phase transition at...
The fusion of viral and host cell membranes is a pivotal step in the infection and life cycle of any virus. The coronaviridae present a taxonomic family with a complex and highly diverse fusion behavior across different species and viral host environments. Despite the massive global research interest in SARS-CoV-2 many aspects of the fusion process are still only rudimentarily understood....
A low-temperature routine to realize inorganic hole-blocking layers (HBLs) is important for the commercialization of perovskite solar cells. Fabricating HBLs at low temperature is energy-saving and compatible with flexible substrates. In this work, titania thin films are synthesized at low temperature with the sol-gel method templated by a diblock copolymer. Tailoring titania film morphology...
Gold deposition via high power impulse magnetron sputtering (HiPIMS) allows to coat thin metal layers on heat sensitive materials such as polymers allowing for increased adhesion and density. HiPIMS allows deposition at a lower total deposited thermal energy in comparison to conventional magnetron sputtering, but this energy is delivered in a very short pulse exhibiting very high power and...
Neutron single crystal diffraction provides an experimental method for the direct location of hydrogen and deuterium atoms in biological macromolecules. At the FRM II neutron source the neutron single crystal diffractometer BIODIFF, a joint project of the Forschungszentrum Jülich and the FRM II, is dedicated to the structure determination of enzymes. Typical scientific questions address the...
HEiDi is one of only two single crystal diffractometers (SCD) using hot unpolarized neutrons worldwide. Many scientific topics on compounds in battery or information technology with light and/or highly absorbing elements profit from comprehensive structure analysis up to high Q as well as experiments using absorbing sample environments like pressure cells. In order to maximize the large...